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M^3 Modifications

post #1 of 13
Thread Starter 
Hello I recently purchased a YMB M^3 with sigma power supply, but is it possible to convert it from single ended to a true balanced design? If it is reasonably possible, is their a person here on head-fi that knows how to do it?

Thanks,

Thomas

PS: I want to use a balanced DAC, and that requires a balanced amp.
post #2 of 13

Anything is possible. 

Is it economical? 

 

Just build a balanced M3, the AMB documentation shows how. 

post #3 of 13
Thread Starter 
Quote:
Originally Posted by nikongod View Post

Anything is possible. 
Is it economical? 

Just build a balanced M3, the AMB documentation shows how. 

I don't know how. Do you? Have you successfully built a balanced M^3?
post #4 of 13

It's all on AMB's website. Click "Other options" in the M³ project. He explains what needs to be done to get it balanced. You'll need two boards instead of one. You'll have to buy a custom chassis to fit two boards. σ22 is the recommended psu if you're going balanced. The active ground channels can be left unpopulated.

post #5 of 13
Thread Starter 
Quote:
Originally Posted by HeadFi Fanatic View Post

It's all on AMB's website. Click "Other options" in the M³ project. He explains what needs to be done to get it balanced. You'll need two boards instead of one. You'll have to buy a custom chassis to fit two boards. σ22 is the recommended psu if you're going balanced. The active ground channels can be left unpopulated.

Do you know how to turn a M^3 balanced from single ended? I don't trust myself with DIY, and if your up for it, perhaps I could pay you to balance the amp?

Thanks,

Thomas
post #6 of 13
Quote:
Originally Posted by vampire5003 View Post


Do you know how to turn a M^3 balanced from single ended? I don't trust myself with DIY, and if your up for it, perhaps I could pay you to balance the amp?

Thanks,

Thomas

Honestly its going to be A LOT of wasted parts if you try to convert single ended to balanced on the M^3.  You might better off starting from scratch.  Because you will need an all new case and also you will be wasting all the parts in the active ground channel of the already build board as well as the case.  Also I am not sure if you have a walwart with the amp or you used an O22 but you will need an O22 potentially with different parts.  

 

I suggest you sell the current amp and start over on a new balanced M^3.  And you should also try building it.  It is fun and is also a nice learning experience.  


Edited by Zashoomin - 8/28/13 at 1:51am
post #7 of 13
Thread Starter 
Quote:
Originally Posted by Zashoomin View Post

Honestly its going to be A LOT of wasted parts if you try to convert single ended to balanced on the M^3.  You might better off starting from scratch.  Because you will need an all new case and also you will be wasting all the parts in the active ground channel of the already build board as well as the case.  Also I am not sure if you have a walwart with the amp or you used an O22 but you will need an O22 potentially with different parts.  

I suggest you sell the current amp and start over on a new balanced M^3.  And you should also try building it.  It is fun and is also a nice learning experience.  

Is $800 a good price for a used balanced m^3? My single ended m^3 was $500. Hmm....both are YMB made as well.
post #8 of 13
Quote:
Originally Posted by vampire5003 View Post


Is $800 a good price for a used balanced m^3? My single ended m^3 was $500. Hmm....both are YMB made as well.

Well it depends on what the power supply is. 

post #9 of 13
Thread Starter 
Quote:
Originally Posted by Zashoomin View Post

Well it depends on what the power supply is. 

Dual Sigma o11's, the seller said first case has the Dual Sigma O11 PSU's, and the second case is supposedly the amplifier itself.
Edited by vampire5003 - 8/29/13 at 6:13pm
post #10 of 13

I took a quick look at YBM's website. If you don't want a single-ended amp, sell it and get version 3, which is balanced.

post #11 of 13

You could also get balanced input transformers and run the output single ended.

post #12 of 13
Quote:
Originally Posted by vampire5003 View Post

PS: I want to use a balanced DAC, and that requires a balanced amp.

 

Maybe I'm very tired, and a little pedantic, but are your headphones modified to be balanced?  If not, then you don't need a balanced amp.  A balanced output (XLR, 1/4" TRS, etc...) can drive an unbalanced input (RCA, 1/8" trs, etc...) just fine.  (you can also drive a balanced input with an unbalanced output as well, but that's another subject)

 

If the only reason you want a balanced amp is because you have a balanced DAC, then just get some XLR to RCA cables and call it a day, or if you want to buy new gear, do as Nikon said and just get some balanced in/unbalanced out transformers to put between your DAC and amp.

 

And if you want to make your own cable here's the pin out:

XLR     RCA
1        Shield

2        Center pin

3        N/C

post #13 of 13

You can contact Ying at YBM and see what he can do for you if you ship your unit back to him in trade for a fully balanced unit (balanced input from the DAC that is, then your choice of how you want the HP connectors ... Ying can give you both balanced and s.e. HP outs, and the balanced can be dual XLR's or 4-pin).

 

I will stand up for Ying -- a great builder, fantastic communicator, never late -- I was so impressed with his work for me that, when on a biz trip to San Fran, I looked him up and treated him to dinner!  And let's have a shout-out for the AMB designs. As Nikongod will attest (he's heard mine), the Beta 22 with Senn 850's is jaw-dropping awesome, and the M^3 with AD2K's, while not quite at the level of the Beta 22/Senn 850 combo, is also amazing.

 

All built for me with custom mods by YBM.  Can't go wrong with the AMB / YBM duo.  And a big thanks to Bozebuttons, who several years ago steered me to Beta 22 and YBM -- I was just about to buy a different amp from another builder at the Florida Can Jam when he stopped me.  I would have gotten burned (and not just for money ... the other guys's amps actually catch fire).

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